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. 2022 Feb 11;22:115. doi: 10.1186/s12877-022-02793-2

Fig. 1.

Fig. 1

Participants of the KORA-Age 1 and KORA-Age 3. Combined study population (N = 3,377) and birth phases. 2008 and 2015 referred to the years for the age calculation in two studies. Phases were defined based on participants critical developmental age (prenatal gestation or the first two years of life) and the World War II situation in Germany